Static Shield
i checked it out, and the block duration is actually 2 seconds. i honestly dont know what the 1.5 seconds means…
Street Regulator
Not entirely sure, but maybe 1.5 seconds of the block stuns, last .5 or first .5 is just a block?
Basic [BS] NSP/Mag
You have 1.5s to activate stun, but the block lasts 2s.
I think it may also mean that you only have 1.5 seconds to decide if you want to throw the shield, although the block will last up to 2 seconds if you don’t throw the shield. Something like that. Haven’t really tested it though.
The tooltip is a bit odd in this regard though. Would just make sense to have it list a 2 second cast time. If you look at something like shield stance, it lists a 3 second cast time for a 3 second block.